To solve the intrinsic shortcomings in general oil layer recognition methods,which is hard to obtain an ideal effect in application,the oil layer recognition model of LS-SVM based on the improved PSO algorithm is presented to iteratively solve the linear system of equations in LS-SVM algorithm,which is a new improved form by synthesized the existing model of PSO.By using the improved LS-SVM algorithm,the problem of solving inverse matrix is resolved and the training velocity of LS-SVM algorithm is quickened...